Dawnhand Dissident should allow me to cast creature spells from among cards it exiled by removing three counters from among creatures I control

Expected behavior:

Given I have exiled a creature card with [[Dawnhand Dissident]], e.g. by activating its second ability,
Given I control two creatures with a combined total of three counters between them,
When I attempt to cast that creature card from exile,
Then I should be able to pay the alternate cost imposed by Dawnhand Dissident by removing two counters from one creature and one counter from a different creature.

Current behavior:

Given I have exiled a creature card with [[Dawnhand Dissident]], e.g. by activating its second ability,
Given I control two creatures with a combined total of three counters between them,
When I attempt to cast that creature card from exile,
Then I am unable to pay the alternate cost imposed by Dawnhand Dissident because I cannot remove three counters from a single creature.

Locate the Dawnhand Dissident card implementation and the alternate-cost payment entry point, then trace how its second ability handles cards exiled by it. Reproduce the case with two creatures holding three counters in total; done means the creature spell can be cast from exile by removing two counters from one creature and one from another.

Written by the indexing model from the issue text.